Alarsvi-lock



(No Model.)

W. G. BENNETT.

' ALARM LOOK. 7

No. 344,806. Patented July 6, 188 6.,

227.1 I Z p-4..

PETERS, mm-um n mr, wmm uon, n. c.

. full, clear, and exact description of the inven- VILLIAMGORDONBENNETT, OF

ALARM- PATENT SHARPSBURG, PENNSYLVANIA.

LOCK.

LSPECJIPICATIQN forming part of Letters Application filed llIarch 520,1886. Serial No. 196,032.

To all whom it may concern.-

Be it known that I, WILLIAM GORDON BEN- NETT, a citizen of the UnitedStates, residing at Sharpsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inAlarm-Locks; and I do hereby declare the following to be a tion, such aswill enable others skilled in the art to which it pertains to make anduse the same, reference being had to the accompanying drawings, whichform a part of this speciiication.

My invention relates to an improvement in burglar-alarm door-locks, theobject being to provide a door lock having a burglaralarm arrangedinside the shell in a manner that the door to which the lock is attachedcannot be opened or the lock tampered with without sounding an alarm andthereby giving a warning to the inmates of the house; and with this endin view myinvention consists in certain details of construction andcombination of parts, as will be more fully set forth hereinafter.

In the accompanying drawings, Figure 1 is a front sectional elevation ofa door-lock pro vided with my improved burglar-alarm constructed inaccordance with my invention. Fig. 2 is an end elevation of the same,wherein the recess at the rear of the lock is shown, which provides ameans for introducing the cap or cartridge in position. Fig. 3 is anexterior front view showing the position of the knobs and key-holes.Fig. 4: is a sectional elevation of another means for securing the capor cartridge in position.

To put my invention into practice, I provide a shell, a, and cover I),which differs in no essential feature from those now in common use,except at the rear, where I form a receptacle, c, for the cap orcartridge d. I now provide two bolts, 0 f, the one operated bya key andthe other by a large knob, g, similar to those of the ordinary lock.Between these bolts 0 f, I place another, It, having a verticalextension, 1', at one end, which, when the bolt h is pushed forward intothe keeper by means of a small knob, j, working in a slot, k, on theoutside of the lock, covers or closes the keyhole Z, which prevents thelock from being i opened by a key from the outside of the door.

Patent No. 344,806, dated July 6, i886.

(No model.)

At the rear of this bolt h, I place a horizontal bar, at, pivoted at ornear the middle, the one end nearest the bolt It being beveled orinclined, whichworks against a similar bevel or incline formed on theend of the bolt h, as will be more fully described hereinafter. On theunder side of this horizontal bar at is formed an open slot or recess,42, having inclined sides, which fits neatly about a projection, 0, onthe bolt f, placed below. Above this bar m, I pivot a hammer, 9, havinga square opening, q, formed in the pivot, which provides a means foroperating the hammer p from the outside of the look, by means of a keyconstructed for that purpose. A small projection, g, on the pivotal endof the hammer p, in conjunction with another, 1', on the inclinedsurface s of the bar at, provides a means for suspending the hammer p ina Vertical position. A strong spiral spring, t, se cured to the hammer19 and side of the lockcase, forces the hammer 12 down with sufficientforce to explode the cap or cartridge d when released from theprojection r on the bar in. A cylindrical receptacle, 0, formed in oneend of the lock, within reach of the hammer 1), provides a holder forthe cap or cartridge (1, which fmay be placed in position from theoutside through the recess a, formed in the rear of the lock. Thecartridge d may be set in a thimble, t, and screwed into a recess, c,formed in the rear of the look, (see Fig. 4,) with the samesquare'pointed key used for revolving or setting the hammer p.

The operation is as follows: The door to which the lock is attachedisclosed and locked from the inside by means of a key in the same manneras in a common lock. The central bolt, h, is now pushed forward into thekeeper by means of the small knob j, which operation brings the verticalprojection i on the bolt it across the key-hole Z, thereby preventing akey from being placed in the look from the outside of the door. A key isnow placed in the square opening q, formed in the pivot of the hammer p,and turned or revolved until the small projection g on the hammer p isin the bar m, releases the hammer p, and, descending with force,explodes the cap or cartridge d. Should the central bolt, h, be movedback from the keeper, the inclined face 2; on the bolt h, engaging withthat of the bar m, releases the hammer p from the projection r and givesan alarm, as before described.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent, 1s

1. In a combined door-lock and burglaralarm, the combination, consistingof the shell a and bolts e f, operated as described, the hammer p,actuated by the spring t, and a means for setting or securing the sameabove the receptacle 0 for the cap or cartridge d, the receptacle 0,formed at the rear of the lock, and recess communicating with thereceptacle c from the outside of the lock, the vertical projection t onthe bolt h, for closing the keyhole, the inclined surfaces 81* on thebar m, and

bolt h, for releasing the hammer p, the projection 0 on the bolt f, andcorresponding depression, a, in the bar m, as a means for releasing thehammer p when the bolt f is disturbed, substantially as set forth anddescribed.

2. In combination with a combined doorlock and burglar-alarm providedwith a hammer, p, and spring t, and a means for operating the same bythe action of the look, a thimble, 15, provided with a screw-thread, inwhich the cap or cartridge d is placed, and a recess, '0, formed in therear of the lock, provided with a corresponding screw-thread forsecuring the thimble 16 therein, as and for the purpose set forth.

WILLIAM GORDON BENNETT.

Witnesses:

W. O. BARR, M. E. HARRISON.

